Robert Ross, 29, was last seen about 5 p.m. Friday at the Domino's Pizza on Jefferson Street in Jackson, police said. According to the restaurant manager, Ross went to Arkansas to pick up his girlfriend, police said.

The Jackson Police Department's Missing Persons Unit was contacted Monday by the Chico County, Ark., Sheriff's Office after Ross's vehicle was found on the side of the road south of Lake Village, Ark.

Ross was not with the vehicle, police said.

JPD is working with the Chico County sheriff and the Arkansas Crime Lab to find Ross. Anyone with information about his whereabouts is asked to call Crime Stoppers at 601-355-TIPS.

Gen. David Petraeus pleaded guilty to federal charges Tuesday to end a probe into whether he provided classified information to his mistress when he was CIA director, according to a U.S. official briefed on the matter.